DxRangeSelector.ValueChangeMode Property

Specifies how the Range Selector updates selected range values.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v25.1.dll

NuGet Package: DevExpress.Blazor

Declaration

[DefaultValue(RangeSelectorValueChangeMode.OnHandleRelease)]
[Parameter]
public RangeSelectorValueChangeMode ValueChangeMode { get; set; }

Property Value

Type	Default	Description
RangeSelectorValueChangeMode	OnHandleRelease	An enumeration value.

Available values:

Name	Description
OnHandleRelease	The component updates selected range values once a user drops a slider handle.
OnHandleMove	The component updates selected range values whenever a user drags a slider handle.

Remarks

The Range Selector updates values of the selected range when a user drops a slider handle. This behavior corresponds to the OnHandleRelease mode.

Set the ValueChangeMode property to OnHandleMove to update selected range values whenever a user drags a handle. To respond to value changes, handle the ValueChanged event.

The following code snippet sets the value change mode to OnHandleMove, obtains values of the current range in a ValueChanged event handler, and displays the number of selected days:

<span><b>@DaysCount days are selected</b></span>
<DxRangeSelector Width="1100px"
                 Height="200px"
                 SelectedRangeStartValue="@(new DateTime(2024, 2, 1))"
                 SelectedRangeEndValue="@(new DateTime(2024, 2, 14))"
                 ValueChanged="@OnValueChanged"
                 ValueChangeMode="RangeSelectorValueChangeMode.OnHandleMove">
    <DxRangeSelectorScale StartValue="@(new DateTime(2024, 1, 1))"
                          EndValue="@(new DateTime(2024, 6, 1))"
                          TickInterval="ChartAxisInterval.Week"
                          MinorTickInterval="ChartAxisInterval.Day"
                          MinRange="ChartAxisInterval.Week"
                          MaxRange="ChartAxisInterval.Month"
                          ValueType="ChartAxisDataType.DateTime">
        <DxRangeSelectorScaleMarker>
            <DxRangeSelectorScaleMarkerLabel>
                <DxTextFormatSettings Type="TextFormat.MonthAndYear" />
            </DxRangeSelectorScaleMarkerLabel>
        </DxRangeSelectorScaleMarker>
    </DxRangeSelectorScale>
    <DxRangeSelectorSliderMarker>
        <DxTextFormatSettings Type="TextFormat.MonthAndDay" />
    </DxRangeSelectorSliderMarker>
</DxRangeSelector>

@code {
    double DaysCount { get; set; } = 14;
    void OnValueChanged(RangeSelectorValueChangedEventArgs args) {
        var startDate = args.CurrentRange.FirstOrDefault() as DateTime?;
        var endDate = args.CurrentRange.LastOrDefault() as DateTime?;
        if (startDate != null && endDate != null)
            DaysCount = (endDate - startDate).Value.TotalDays;
    }
}